Question

5 Problems - SHOW ALL WORK!
1. What is the radius if the
Diameter is 20cm?
2. What is the Diameter if the
Radius is 6in?
3. Find the Area of the circle if
the given radius is 3 cm, use
3.14 for pi.
4. Find the Circumference of
the circle if the diameter is
20in. Use 3.14 for pi.

Answer 1

1. Radius = Diameter / 2
Radius = 20cm / 2
Radius = 10cm

2. Diameter = 2 * Radius
Diameter = 2 * 6in
Diameter = 12in

3. Area of a circle = π * radius^2
Area = 3.14 * 3^2
Area = 3.14 * 9
Area = 28.26 cm^2

4. Circumference of a circle = π * diameter
Circumference = 3.14 * 20in
Circumference = 62.8in